Horizontally rotated mounting-type redox flow battery plate frame, single battery and battery stack

Abstract

The present invention belongs to the technical field of redox flow batteries. Disclosed are a horizontally rotated mounting-type redox flow battery plate frame, a single battery and a battery stack. The plate frame comprises electrolyte inlets and outlets, and an electrode cavity, a membrane dividing the electrode cavity into a negative electrode cavity and a positive electrode cavity; positive electrode rotation holes and negative electrode rotation holes are further formed at two sides of the electrode cavity; electrolyte tanks are provided on the opposite upper and lower end surfaces of the plate frame, and satisfy that: after being horizontally rotated 180 degrees, the electrolyte tanks on the lower end surface of the plate frame coincide with the electrolyte tanks on the upper end surface of the plate frame; when a plurality of plate frames are stacked, the electrolyte tanks of the upper and lower plate frames form a positive electrode electrolyte flow channel and a negative electrode electrolyte flow channel. In the present invention, when the plurality of plate frames are stacked, the electrolyte flow channels are formed in double sides, such that the web is fully utilized, reducing regions of relatively great thickness. Thus, during injection molding production, shrinkage defects are reduced and the deformation of plate frames is reduced, improving product reliability. Increasing the utilization rate of the web reduces materials to be used, thus reducing material costs.

Description

A horizontal flip installation type flow battery plate frame, single cell and battery stack Technical Field

[0001] The present invention belongs to the technical field of liquid flow batteries, and in particular relates to a liquid flow battery plate frame, a single cell and a battery stack in a horizontally flip-mounted form. Background Art

[0002] With the development of society and economy, the demand for energy is increasing, and the environmental pressure caused by the large-scale consumption of fossil energy is becoming increasingly prominent. Renewable energy generation such as wind and solar energy is affected by factors such as time, day and night, and season, and has obvious discontinuous, unstable and uncontrollable non-steady-state characteristics. Therefore, large-scale and efficient energy storage technology is highly valued. Among them, flow batteries are recognized as the most promising energy storage technology due to their high safety, large energy storage scale, high efficiency and long life.

[0003] A single cell is a basic component unit in a flow battery stack, and its structure directly affects the size / power / performance of the battery.

[0004] The existing flow battery single cell structures have the following structural forms:

[0005] 1. With the diaphragm as the center, it is symmetrically distributed on both sides, with electrodes, plate frame, and bipolar plates on both sides in sequence.

[0006] 2. The plate and frame are designed as an integrated form, but the plate and frame cannot be fully utilized. Most of them are in the form of single-sided flow channel arrangement, which uses more plate and frame materials and has higher costs.

[0007] 3. Some of them adopt the form of double-sided flow channels, but the flow channels cannot cover the entire plate frame. The main reason why the double-sided flow channels cannot cover the entire plate frame is that there is no reasonable structural layout, which causes the sealing gasket to press the flow channel and make it impossible to seal.

[0008] In summary, the plate and frame of existing flow batteries do not have a reasonable structural layout, cannot fully utilize the plate and frame width, and are relatively expensive.

[0009] Summary of the Invention

[0010] To address the above problems, the present invention provides a flow battery plate frame, single cell, and battery stack in a horizontally flip-mounted form, which adopts the following technical solutions:

[0011] A horizontally flipped flow battery plate frame includes a positive electrode electrolyte inlet, a negative electrode electrolyte inlet, a positive electrode electrolyte outlet, a negative electrode electrolyte outlet, and an electrode cavity, wherein the electrode cavity is divided by a membrane to form a negative electrode cavity and a positive electrode cavity;

[0012] The electrode cavity is located at the center of the plate frame, and a first positive electrode flip hole, a second positive electrode flip hole, a first negative electrode flip hole, and a second negative electrode flip hole are further provided on both sides of the electrode cavity, and satisfy the following conditions: after the plate frame is horizontally rotated 180 degrees, the second positive electrode flip hole coincides with the first positive electrode flip hole, and the second negative electrode flip hole coincides with the first negative electrode flip hole;

[0013] The upper and lower end surfaces of the plate frame are both provided with electrolyte tanks and satisfy the following conditions: the electrolyte tank on the lower end surface of the plate frame is horizontally rotated 180 degrees and overlaps with the electrolyte tank on the upper end surface of the plate frame;

[0014] When multiple plate frames are stacked, the upper plate frame above the current plate frame is horizontally rotated 180 degrees and aligned with the current plate frame, so that the electrolyte tank on the upper end surface of the current plate frame and the electrolyte tank on the lower end surface of the upper plate frame form a positive electrode electrolyte flow channel and a negative electrode electrolyte channel;

[0015] Among them, the positive electrode electrolyte flow channel is connected to the two positive electrode flip holes, the positive electrode cavity, the positive electrode electrolyte inlet, and the positive electrode electrolyte outlet of the current plate frame; the negative electrode electrolyte channel is connected to the two negative electrode flip holes, the negative electrode cavity, the negative electrode electrolyte inlet and the negative electrode electrolyte outlet of the upper plate frame.

[0016] Furthermore, the plate frame is square, and the positive electrode electrolyte inlet, the negative electrode electrolyte inlet, the positive electrode electrolyte outlet and the negative electrode electrolyte outlet are respectively arranged at the four corners of the plate frame.

[0017] Furthermore, the positive electrode electrolyte inlet and the positive electrode electrolyte outlet are arranged along the diagonal of the plate frame, the negative electrode electrolyte inlet and the negative electrode electrolyte outlet are arranged along the diagonal of the plate frame, and the positive electrode electrolyte inlet and the negative electrode electrolyte inlet are respectively located at both ends of the long side of the plate frame.

[0018] Furthermore, a first positive electrode electrolyte tank, a second positive electrode electrolyte tank, a first negative electrode electrolyte tank, a second negative electrode electrolyte tank, a negative electrode dispersion flow channel and a negative electrode collection flow channel are provided on the upper end surface of the plate frame;

[0019] The plate frame is provided with a third positive electrode electrolyte tank, a fourth positive electrode electrolyte tank, a third negative electrode electrolyte tank, a fourth negative electrode electrolyte tank, a positive electrode dispersion flow channel and a positive electrode collection flow channel on the lower end surface opposite to the upper end surface;

[0020] The positive electrode electrolyte flows sequentially through the positive electrode electrolyte inlet, the first positive electrode electrolyte tank, the first positive electrode reversal hole, the positive electrode dispersion flow channel, the positive electrode cavity, the positive electrode collection flow channel, the second positive electrode reversal hole, the second positive electrode electrolyte tank and the positive electrode electrolyte outlet;

[0021] The negative electrode electrolyte flows sequentially through the negative electrode electrolyte inlet, the third negative electrode electrolyte tank, the first negative electrode reversal hole, the negative electrode dispersion flow channel, the negative electrode cavity, the negative electrode collection flow channel, the second negative electrode reversal hole, the fourth negative electrode electrolyte tank and the negative electrode electrolyte outlet.

[0022] Furthermore, the third positive electrolyte tank is located directly below the first positive electrolyte tank, one end of the third positive electrolyte tank is connected to the positive electrolyte inlet, and the other end is closed; the fourth positive electrolyte tank is located directly below the second positive electrolyte tank, one end of the fourth positive electrolyte tank is connected to the positive electrolyte outlet, and the other end is closed;

[0023] The third positive electrode electrolyte tank has the same structure as the second positive electrode electrolyte tank, and the fourth positive electrode electrolyte tank has the same structure as the first positive electrode electrolyte tank.

[0024] Furthermore, one end of the first negative electrode electrolyte tank is connected to the negative electrode electrolyte inlet and the other end is closed, and the third negative electrode electrolyte tank is located below the first negative electrode electrolyte tank; one end of the second negative electrode electrolyte tank is connected to the negative electrode electrolyte outlet and the other end is closed, and the fourth negative electrode electrolyte tank is located below the second negative electrode electrolyte tank;

[0025] The first negative electrode electrolyte tank has the same structure as the fourth negative electrode electrolyte tank, and the second negative electrode electrolyte tank has the same structure as the third negative electrode electrolyte tank.

[0026] Furthermore, when multiple plate frames are stacked, the fourth positive electrode electrolyte tank on the lower end surface of the upper plate frame is sealed with the first positive electrode electrolyte tank on the upper end surface of the current plate frame to form a first positive electrode electrolyte flow channel, and the third positive electrode electrolyte tank on the lower end surface of the upper plate frame is sealed with the second positive electrode electrolyte tank on the upper end surface of the current plate frame to form a second positive electrode electrolyte flow channel;

[0027] The fourth negative electrode electrolyte tank on the lower end surface of the upper plate frame is sealed with the first negative electrode electrolyte tank on the upper end surface of the current plate frame to form a first negative electrode electrolyte flow channel, and the third negative electrode electrolyte tank on the lower end surface of the upper plate frame is sealed with the second negative electrode electrolyte tank on the upper end surface of the current plate frame to form a second negative electrode electrolyte flow channel.

[0028] Furthermore, the positive electrode electrolyte inlet, the first positive electrode electrolyte flow channel, the first positive electrode reversal hole of the current plate frame, the positive electrode dispersion flow channel of the current plate frame, the positive electrode cavity of the current plate frame, the positive electrode collection flow channel of the current plate frame, the second positive electrode reversal hole of the current plate frame, the second positive electrode electrolyte flow channel, and the positive electrode electrolyte outlet are connected in sequence;

[0029] The negative electrode electrolyte inlet, the first negative electrode electrolyte flow channel, the first negative electrode reversal hole of the upper plate frame, the negative electrode dispersion flow channel of the upper plate frame, the negative electrode cavity of the upper plate frame, the negative electrode collection flow channel of the upper plate frame, the second positive electrode reversal hole of the upper plate frame, the second negative electrode electrolyte flow channel, and the negative electrode electrolyte outlet are connected in sequence.

[0030] The present invention also provides a liquid flow battery, comprising the liquid flow battery plate frame, membrane, positive electrode, negative electrode and bipolar plate in the horizontal flip installation form;

[0031] Among them, the membrane is arranged in the electrode cavity of the plate frame, and the membrane divides the electrode cavity of the plate frame into a negative electrode cavity at the upper end face and a positive electrode cavity at the lower end face. The negative electrode is arranged in the negative electrode cavity, the positive electrode is located in the positive electrode cavity, and the bipolar plate is stacked above the negative electrode.

[0032] The present invention also provides a liquid flow battery stack, comprising a plurality of the liquid flow cells. When the plurality of cells are stacked, the cell above the current cell is horizontally rotated 180 degrees for stacking and installation.

[0033] Beneficial effects of the present invention:

[0034] 1. The flow battery plate frame of the present invention is provided with electrolyte tanks on the upper and lower end surfaces relative to each other. When multiple plate frames are stacked, double-sided electrolyte flow channels are formed, which fully utilizes the width and reduces the thicker areas. During injection molding production, shrinkage defects are reduced, deformation of the plate frame is reduced, and product reliability is improved.

[0035] 2. The flow battery plate frame of the present invention improves the width utilization rate, reduces the material used, and thus reduces the material cost.

[0036] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] FIG1 shows an isometric view of a flow battery plate frame in a horizontally flipped installation according to an embodiment of the present invention;

[0039] FIG2 is a schematic diagram showing the upper end surface structure of a flow battery plate frame in a horizontally flipped installation form according to an embodiment of the present invention;

[0040] FIG3 is a schematic structural diagram showing the lower end surface of a flow battery plate frame in a horizontally flipped installation form according to an embodiment of the present invention;

[0041] FIG4 shows an exploded view of a stack of two flow battery plate frames installed in a horizontally flipped manner according to an embodiment of the present invention.

[0042] In the figure: 1. positive electrode electrolyte inlet; 2. negative electrode electrolyte inlet; 3. positive electrode electrolyte outlet; 4. negative electrode electrolyte outlet; 5. electrode cavity; 6. first positive electrode reversal hole; 7. second positive electrode reversal hole; 8. first negative electrode reversal hole; 9. second negative electrode reversal hole; 10. first positive electrode electrolyte tank; 11. second positive electrode electrolyte tank; 12. first negative electrode electrolyte tank; 13. second negative electrode electrolyte tank; 14. negative electrode dispersion flow channel; 15. negative electrode collection flow channel; 16. third positive electrode electrolyte tank; 17. fourth positive electrode electrolyte tank; 18. third negative electrode electrolyte tank; 19. fourth negative electrode electrolyte tank; 20. positive electrode dispersion flow channel; 21. positive electrode collection flow channel. DETAILED DESCRIPTION

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0044] It should be noted that the terms "first", "second" etc. in this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the application described herein. In this application, the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "center", "vertical", "horizontal", "lateral", "longitudinal" etc. are based on the directions or positional relationships shown in the accompanying drawings.

[0045] The present invention provides a flow battery plate frame in a horizontally flipped installation form, which improves the plate frame width utilization rate, reduces plate frame deformation, reduces defects, reduces material usage, and reduces costs; by horizontally flipping each single battery, a complete battery stack can be assembled.

[0046] As shown in FIG1 , a horizontally flipped liquid flow battery plate frame includes a positive electrode electrolyte inlet 1 , a negative electrode electrolyte inlet 2 , a positive electrode electrolyte outlet 3 and a negative electrode electrolyte outlet 4 .

[0047] For example, the plate frame is square, and the positive electrode electrolyte inlet 1, the negative electrode electrolyte inlet 2, the positive electrode electrolyte outlet 3 and the negative electrode electrolyte outlet 4 are respectively arranged at the four corners of the plate frame.

[0048] It should be noted that the electrolyte inlet and outlet are of the same size. After the plate frame is rotated horizontally by 180°, the electrolyte outlet can be used as the inlet, and similarly the inlet can be used as the outlet.

[0049] As shown in Figure 1, the electrode cavity 5 is located in the center of the plate frame, and the first positive pole flip hole 6, the second positive pole flip hole 7, the first negative pole flip hole 8 and the second negative pole flip hole 9 are also provided on both sides of the electrode cavity 5 and meet the following requirements: after the plate frame is rotated horizontally 180°, the second positive pole flip hole 7 coincides with the first positive pole flip hole 6, and the second negative pole flip hole 9 coincides with the first negative pole flip hole 8.

[0050] Electrolyte tanks are provided on the upper and lower end surfaces of the plate frame and meet the following conditions: the electrolytic tank on the lower end surface of the plate frame overlaps with the electrolytic tank on the upper end surface of the plate frame after being horizontally rotated 180 degrees.

[0051] As shown in Figure 4, when multiple plate frames are stacked, the upper plate frame above the current plate frame is horizontally rotated 180° and aligned with the current plate frame, and the electrolyte tank on the upper end face of the current plate frame and the electrolyte tank on the lower end face of the upper plate frame form a positive electrode electrolyte flow channel and a negative electrode electrolyte channel.

[0052] Among them, the positive electrode electrolyte flow channel is connected to the two positive electrode flip holes, the positive electrode cavity 5, the positive electrode electrolyte inlet 1 and the positive electrode electrolyte outlet 3 of the current plate frame; the negative electrode electrolyte flow channel is connected to the two negative electrode flip holes, the negative electrode cavity 5, the negative electrode electrolyte inlet 2 and the negative electrode electrolyte outlet 4 of the upper plate frame.

[0053] For example, the positive electrode electrolyte inlet 1 and the positive electrode electrolyte outlet 3 are arranged along the diagonal of the plate frame, and the negative electrode electrolyte inlet 2 and the negative electrode electrolyte outlet 4 are arranged along the diagonal of the plate frame. The positive electrode electrolyte inlet 1 and the negative electrode electrolyte inlet 2 are respectively located at the two ends of the long side of the plate frame, which facilitates the arrangement of the electrolyte flow channel.

[0054] As shown in FIG2 , for example, a first positive electrode electrolyte tank 10 , a second positive electrode electrolyte tank 11 , a first negative electrode electrolyte tank 12 , a second negative electrode electrolyte tank 13 , a negative electrode dispersion channel 14 and a negative electrode collection channel 15 are provided on the upper end surface of the plate frame.

[0055] As shown in FIG3 , the plate frame is provided with a third positive electrode electrolyte tank 16 , a fourth positive electrode electrolyte tank 17 , a third negative electrode electrolyte tank 18 , a fourth negative electrode electrolyte tank 19 , a positive electrode dispersion channel 20 and a positive electrode collection channel 21 on the lower end surface opposite to the upper end surface.

[0056] For example, the electrode cavity 5 is square, and the electrode cavity 5 is set in the middle of the plate frame. The electrode cavity 5 is divided by a membrane to form a negative electrode cavity 5 on the upper end surface and a positive electrode cavity 5 on the lower end surface.

[0057] The first positive electrode reversal hole 6 and the first negative electrode reversal hole 8 are located on one side of the electrode cavity 5 , and the second positive electrode reversal hole 7 and the second negative electrode reversal hole 9 are located on the other side of the electrode cavity 5 .

[0058] One end of the negative electrode dispersion flow channel 14 is connected to the first negative electrode reversal hole 8, and the other end of the negative electrode dispersion flow channel 14 is connected to one end of the negative electrode collection flow channel 15 to form an electrolyte flow channel surrounding the negative electrode cavity 5, and the other end of the negative electrode collection flow channel 15 is connected to the second negative electrode reversal hole 9.

[0059] One end of the positive electrode dispersion channel 20 is connected to the first positive electrode reversal hole 6, and the other end of the positive electrode dispersion channel 20 is connected to one end of the positive electrode collection channel 21 to form an electrolyte flow channel surrounding the positive electrode cavity 5, and the other end of the positive electrode collection channel 21 is connected to the second positive electrode reversal hole 7.

[0060] As shown in Figures 2 and 3, the positive electrolyte flows through the positive electrolyte inlet 1, the first positive electrolyte tank 10, the first positive electrode reversal hole 6, the positive electrode dispersion flow channel 20, the positive electrode cavity 5, the positive electrode collection flow channel 21, the second positive electrode reversal hole 7, the second positive electrolyte tank 11 and the positive electrolyte outlet 3 in sequence.

[0061] As shown in Figures 2 and 3, the negative electrode electrolyte flows in sequence through the negative electrode electrolyte inlet 2, the third negative electrode electrolyte tank 18, the first negative electrode reversal hole 8, the negative electrode dispersion flow channel 14, the negative electrode cavity 5, the negative electrode collection flow channel 15, the second negative electrode reversal hole 9, the fourth negative electrode electrolyte tank 19 and the negative electrode electrolyte outlet 4.

[0062] As shown in Figure 3, the third positive electrolyte tank 16 is located directly below the first positive electrolyte tank 10, one end of the third positive electrolyte tank 16 is connected to the positive electrolyte inlet 1, and the other end is closed; the fourth positive electrolyte tank 17 is located directly below the second positive electrolyte tank 11, one end of the fourth positive electrolyte tank 17 is connected to the positive electrolyte outlet 3, and the other end is closed.

[0063] The third positive electrode electrolyte tank 16 has the same structure as the second positive electrode electrolyte tank 11 , and the fourth positive electrode electrolyte tank 17 has the same structure as the first positive electrode electrolyte tank 10 .

[0064] As shown in Figure 2, one end of the first negative electrode electrolyte tank 12 is connected to the negative electrode electrolyte inlet 2, and the other end is closed. The third negative electrode electrolyte tank 18 is located below the first negative electrode electrolyte tank 12; one end of the second negative electrode electrolyte tank 13 is connected to the negative electrode electrolyte outlet 4, and the other end is closed. The fourth negative electrode electrolyte tank 19 is located below the second negative electrode electrolyte tank 13.

[0065] The first negative electrode electrolyte tank 12 and the fourth negative electrode electrolyte tank 19 have the same structure, and the second negative electrode electrolyte tank 13 and the third negative electrode electrolyte tank 18 have the same structure.

[0066] As shown in Figure 4, when multiple plate frames of the present invention are stacked, the fourth positive electrode electrolyte tank 17 on the lower end surface of the upper plate frame is sealed with the first positive electrode electrolyte tank 10 on the upper end surface of the current plate frame to form a first positive electrode electrolyte flow channel, and the third positive electrode electrolyte tank 16 on the lower end surface of the upper plate frame is sealed with the second positive electrode electrolyte tank 11 on the upper end surface of the current plate frame to form a second positive electrode electrolyte flow channel.

[0067] The fourth negative electrode electrolyte tank 19 on the lower end surface of the upper plate frame is sealed with the first negative electrode electrolyte tank 12 on the upper end surface of the current plate frame to form a first negative electrode electrolyte flow channel, and the third negative electrode electrolyte tank 18 on the lower end surface of the upper plate frame is sealed with the second negative electrode electrolyte tank 13 on the upper end surface of the current plate frame to form a second negative electrode electrolyte flow channel.

[0068] Among them, the positive electrode electrolyte inlet 1, the first positive electrode electrolyte flow channel, the first positive electrode reversal hole 6 of the current plate frame, the positive electrode dispersion flow channel 20 of the current plate frame, the positive electrode cavity 5 of the current plate frame, the positive electrode collection flow channel 21 of the current plate frame, the second positive electrode reversal hole 7 of the current plate frame, the second positive electrode electrolyte flow channel, and the positive electrode electrolyte outlet 3 are connected in sequence;

[0069] The negative electrode electrolyte inlet 2, the first negative electrode electrolyte flow channel, the first negative electrode reversal hole 8 of the upper plate frame, the negative electrode dispersion flow channel 14 of the upper plate frame, the negative electrode cavity 5 of the upper plate frame, the negative electrode collection flow channel 15 of the upper plate frame, the second positive electrode reversal hole 7 of the upper plate frame, the second negative electrode electrolyte flow channel, and the negative electrode electrolyte outlet 4 are connected in sequence.

[0070] For example, the first positive electrode electrolyte tank 10, the second positive electrode electrolyte tank 11, the first negative electrode electrolyte tank 12, the second negative electrode electrolyte tank 13, the third positive electrode electrolyte tank 16, the fourth positive electrode electrolyte tank 17, the third negative electrode electrolyte tank 18 and the fourth negative electrode electrolyte tank 19 can be set to be L-shaped, or can be set to other shapes as needed.

[0071] For example, the negative electrode dispersion channel 14 is connected to the negative electrode collection channel 15 to form a square electrolyte flow channel surrounding the negative electrode cavity 5; the positive electrode dispersion channel 20 is connected to the positive electrode collection channel 21 to form a square electrolyte flow channel surrounding the positive electrode cavity 5.

[0072] For example, when multiple plate frames are stacked, the cross-sectional shape of the first positive electrode electrolyte flow channel, the second positive electrode electrolyte flow channel, the first negative electrode electrolyte flow channel and the second negative electrode electrolyte flow channel formed by the upper plate frame and the current plate frame can be rectangular or trapezoidal. For example, when the plate frame is machined, the electrolyte flow channel can be set to a rectangle for easy machining; when the plate frame is injection molded, the electrolyte flow channel can be set to a trapezoid.

[0073] The horizontally flip-mounted flow battery plate frame of the present invention features electrolyte flow channels on both end surfaces, fully utilizing the plate frame's surface area and reducing thicker areas. This reduces shrinkage defects and plate frame deformation during injection molding, thereby improving product reliability. This improved surface area utilization reduces material usage, thereby lowering material costs.

[0074] Based on the above-mentioned horizontally flipped installation form of the liquid flow battery plate frame, the present invention also provides a liquid flow battery, including the above-mentioned plate frame, a membrane, a positive electrode, a negative electrode and a bipolar plate.

[0075] Among them, the membrane is arranged in the electrode cavity 5 of the plate frame, and the membrane divides the electrode cavity 5 of the plate frame into a negative electrode cavity 5 at the upper end face and a positive electrode cavity 5 at the lower end face. The negative electrode is arranged in the negative electrode cavity 5, the positive electrode is located in the positive electrode cavity 5, and the bipolar plate is stacked above the negative electrode.

[0076] The present invention also provides a liquid flow battery stack, comprising a plurality of the above-mentioned single cells. When the multiple single cells are stacked, the single cell above the current single cell is horizontally rotated 180 degrees for stacking and installation.

[0077] In order to achieve sealing of the flow channel, the present invention is combined with a double-sided flow channel, and two adjacent groups of single cells can be stacked and installed by rotating them horizontally 180 degrees.

[0078] While reducing the cost of the single battery of the present invention, the volume of the entire battery stack can also be reduced, indirectly reducing the footprint of the entire battery system.

[0079] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A liquid flow battery plate frame in a horizontal flip installation form, characterized in that: It includes a positive electrode electrolyte inlet, a negative electrode electrolyte inlet, a positive electrode electrolyte outlet, a negative electrode electrolyte outlet and an electrode cavity, wherein the electrode cavity is divided by a membrane to form a negative electrode cavity and a positive electrode cavity; The electrode cavity is located at the center of the plate frame, and a first positive electrode flip hole, a second positive electrode flip hole, a first negative electrode flip hole and a second negative electrode flip hole are also provided on both sides of the electrode cavity and meet the following conditions: after the plate frame is horizontally rotated 180°, the second positive electrode flip hole coincides with the first positive electrode flip hole, and the second negative electrode flip hole coincides with the first negative electrode flip hole; The upper and lower end surfaces of the plate frame are both provided with electrolyte tanks and meet the following conditions: the electrolyte tank on the lower end surface of the plate frame is horizontally rotated 180° to overlap with the electrolyte tank on the upper end surface of the plate frame; When a plurality of the plate frames are stacked, the upper plate frame above the current plate frame is horizontally rotated 180° and aligned with the current plate frame, so that the electrolyte tank on the upper end surface of the current plate frame and the electrolyte tank on the lower end surface of the upper plate frame form a positive electrode electrolyte flow channel and a negative electrode electrolyte channel; Among them, the positive electrode electrolyte flow channel is connected with the two positive electrode flip holes, the positive electrode cavity, the positive electrode electrolyte inlet, and the positive electrode electrolyte outlet of the current plate frame; the negative electrode electrolyte channel is connected with the two negative electrode flip holes, the negative electrode cavity, the negative electrode electrolyte inlet and the negative electrolyte outlet of the upper plate frame.

2. The horizontal flip installation type flow battery plate frame according to claim 1 is characterized in that: The plate frame is square, and the positive electrode electrolyte inlet, the negative electrode electrolyte inlet, the positive electrode electrolyte outlet and the negative electrode electrolyte outlet are respectively arranged at the four corners of the plate frame.

3. The horizontal flip installation type flow battery plate frame according to claim 2 is characterized in that: The positive electrolyte inlet and the positive electrolyte outlet are arranged along the diagonal of the plate frame, the negative electrolyte inlet and the negative electrolyte outlet are arranged along the diagonal of the plate frame, and the positive electrolyte inlet and the negative electrolyte inlet are respectively located at both ends of the long side of the plate frame.

4. The horizontal flip installation type flow battery plate frame according to claim 1 is characterized in that: The upper end surface of the plate frame is provided with a first positive electrode electrolyte tank, a second positive electrode electrolyte tank, a first negative electrode electrolyte tank, a second negative electrode electrolyte tank, a negative electrode dispersion flow channel and a negative electrode collection flow channel; The plate frame is provided with a third positive electrode electrolyte tank, a fourth positive electrode electrolyte tank, a third negative electrode electrolyte tank, a fourth negative electrode electrolyte tank, a positive electrode dispersion flow channel and a positive electrode collection flow channel on the lower end surface opposite to the upper end surface; The positive electrode electrolyte flows sequentially through the positive electrode electrolyte inlet, the first positive electrode electrolyte tank, the first positive electrode reversal hole, the positive electrode dispersion flow channel, the positive electrode cavity, the positive electrode collection flow channel, the second positive electrode reversal hole, the second positive electrode electrolyte tank and the positive electrode electrolyte outlet; The negative electrode electrolyte flows sequentially through the negative electrode electrolyte inlet, the third negative electrode electrolyte tank, the first negative electrode reversal hole, the negative electrode dispersion flow channel, the negative electrode cavity, the negative electrode collection flow channel, the second negative electrode reversal hole, the fourth negative electrode electrolyte tank and the negative electrode electrolyte outlet.

5. The horizontal flip installation type flow battery plate frame according to claim 4 is characterized in that: The third positive electrolyte tank is located directly below the first positive electrolyte tank, one end of the third positive electrolyte tank is connected to the positive electrolyte inlet, and the other end is closed; the fourth positive electrolyte tank is located directly below the second positive electrolyte tank, one end of the fourth positive electrolyte tank is connected to the positive electrolyte outlet, and the other end is closed; The third positive electrode electrolyte tank has the same structure as the second positive electrode electrolyte tank, and the fourth positive electrode electrolyte tank has the same structure as the first positive electrode electrolyte tank.

6. The horizontal flip installation type flow battery plate frame according to claim 5 is characterized in that: One end of the first negative electrode electrolyte tank is connected to the negative electrode electrolyte inlet, and the other end is closed, and the third negative electrode electrolyte tank is located below the first negative electrode electrolyte tank; one end of the second negative electrode electrolyte tank is connected to the negative electrode electrolyte outlet, and the other end is closed, and the fourth negative electrode electrolyte tank is located below the second negative electrode electrolyte tank; The first negative electrode electrolyte tank has the same structure as the fourth negative electrode electrolyte tank, and the second negative electrode electrolyte tank has the same structure as the third negative electrode electrolyte tank.

7. The horizontal flip installation type flow battery plate frame according to claim 6 is characterized in that: When multiple plate frames are stacked, the fourth positive electrode electrolyte tank on the lower end surface of the upper plate frame is sealed with the first positive electrode electrolyte tank on the upper end surface of the current plate frame to form a first positive electrode electrolyte flow channel, and the third positive electrode electrolyte tank on the lower end surface of the upper plate frame is sealed with the second positive electrode electrolyte tank on the upper end surface of the current plate frame to form a second positive electrode electrolyte flow channel; The fourth negative electrode electrolyte tank on the lower end surface of the upper plate frame is sealed with the first negative electrode electrolyte tank on the upper end surface of the current plate frame to form a first negative electrode electrolyte flow channel, and the third negative electrode electrolyte tank on the lower end surface of the upper plate frame is sealed with the second negative electrode electrolyte tank on the upper end surface of the current plate frame to form a second negative electrode electrolyte flow channel.

8. The horizontal flip installation type flow battery plate frame according to claim 7 is characterized in that: The positive electrode electrolyte inlet, the first positive electrode electrolyte flow channel, the first positive electrode reversing hole of the current plate frame, the positive electrode dispersion flow channel of the current plate frame, the positive electrode cavity of the current plate frame, the positive electrode collection flow channel of the current plate frame, the second positive electrode reversing hole of the current plate frame, the second positive electrode electrolyte flow channel, and the positive electrode electrolyte outlet are connected in sequence; The negative electrode electrolyte inlet, the first negative electrode electrolyte flow channel, the first negative electrode reversal hole of the upper plate frame, the negative electrode dispersion flow channel of the upper plate frame, the negative electrode cavity of the upper plate frame, the negative electrode collection flow channel of the upper plate frame, the second positive electrode reversal hole of the upper plate frame, the second negative electrode electrolyte flow channel, and the negative electrode electrolyte outlet are connected in sequence.

9. A liquid flow cell, characterized in that: A flow battery plate frame, a membrane, a positive electrode, a negative electrode and a bipolar plate in a horizontally flipped installation form as described in any one of claims 1 to 8; Among them, the membrane is arranged in the electrode cavity of the plate frame, and the membrane divides the electrode cavity of the plate frame into a negative electrode cavity at the upper end face and a positive electrode cavity at the lower end face. The negative electrode is arranged in the negative electrode cavity, the positive electrode is located in the positive electrode cavity, and the bipolar plate is stacked above the negative electrode.

10. A liquid flow battery stack, characterized in that: The invention comprises a plurality of liquid flow cells as described in claim 9. When the plurality of cells are stacked, the cell above the current cell is horizontally rotated 180 degrees for stacking and installation.

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